Centering OK button within a MessageBox in winforms

Question

I am learning C#, and as a part of it I wrote small app that consists of form with two groups of buttons, two buttons each. Button for closing of app is added as well. And everything works ok. Also there is MessageBox, showing that the app is going to be closed. And here is little problem that bugs me: OK button within that MessageBox is NOT centered horizontally. I guess there is a method to align that button, but what puzzles me is why it's is not centered by default? As illustration here are screenshots:

Here is code as well:

using System;
using System.Drawing;
using System.Windows.Forms;

public class myForm : Form
{
    private GroupBox gboxGrp1;
    private GroupBox gboxGrp2;

    private RadioButton butn1a;
    private RadioButton butn1b;
    private RadioButton butn2a;
    private RadioButton butn2b;
    private Button btnClose;

    public myForm()
    {
        InitializeComponent();
    }

    private void InitializeComponent()
    {
        this.btnClose = new Button();

        this.gboxGrp1 = new GroupBox();
        this.gboxGrp2 = new GroupBox();

        this.butn1a = new RadioButton();
        this.butn1b = new RadioButton();
        this.butn2a = new RadioButton();
        this.butn2b = new RadioButton();

        //myForm
        this.Text = "My Form";
        this.StartPosition = FormStartPosition.CenterScreen;
        this.Height = 350;
        this.Width = 200;

        //btnClose
        this.Controls.Add(btnClose);
        this.btnClose.Text = "Close";
        this.btnClose.Location = new Point(60, 260);
        this.btnClose.Click += new EventHandler(btnClose_Click);

        //gboxgrp1
        this.gboxGrp1.Location = new Point(20, 20);
        this.gboxGrp1.Text = "Group Box 1";
        this.gboxGrp1.Width = 150;
        this.gboxGrp1.Height = 100;

        //gboxgrp2
        this.gboxGrp2.Text = "Group Box 2";
        this.gboxGrp2.Location = new Point(20, 130);
        this.gboxGrp2.Width = 150;
        this.gboxGrp2.Height = 100;

        //Radio buttons
        this.butn1a.Text = "Radio 1a";
        this.butn1a.Location = new Point(30, 30);
        this.butn1a.Size = new Size(90, 15);

        this.butn1b.Text = "Radio 1b";
        this.butn1b.Location = new Point(30, 60);
        this.butn1b.Size = new Size(90, 15);

        this.butn2a.Text = "Radio 2a";
        this.butn2a.Location = new Point(30, 30);
        this.butn2a.Size = new Size(90, 15);

        this.butn2b.Text = "Radio 2b";
        this.butn2b.Location = new Point(30, 70);
        this.butn2b.Size = new Size(90, 15);

        //Controls
        this.Controls.Add(gboxGrp1);
        this.Controls.Add(gboxGrp2);

        this.gboxGrp1.Controls.Add(butn1a);
        this.gboxGrp1.Controls.Add(butn1b);
        this.gboxGrp2.Controls.Add(butn2a);
        this.gboxGrp2.Controls.Add(butn2b);
    }

    private void btnClose_Click(object sender, EventArgs e)
    {
        MessageBox.Show("Closing Application");
        Application.Exit();
    }
}

public class MyApp
{
    public static void Main()
    {
        Application.Run(new myForm());
    }
}

Answer 1

You can't restyle the default MessageBox as that's completely depends on the windows OS theme. However you could create your own message box by simply creating a new form and then call it by using newMessagebox.ShowDialog();